scan.l simplifications

In scan.l, there is:

decimal (({digit}*\.{digit}+)|({digit}+\.{digit}*))
real
((({digit}*\.{digit}+)|({digit}+\.{digit}*)|({digit}+))([Ee][-+]?{digit}+))

Could this be simplified as:

decimal (({integer}?\.{integer})|({integer}\.{integer}?))
real ((({decimal})|({integer}))([Ee][-+]?{integer}))

What is the reason if it shouldn't be? This is just an educational question,
I guess. I wouldn't want to waste time writing bad patches. :) I ran regress
with this change and it looked ok.

One reason I can think of right now, is that if the definition of integer or
decimal were to change, it might break decimal and real. Another reason
might be a performance loss?

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